## Abstract

We report on continuous-wave lasing of ${\mathrm{Yb}}^{3+}$ at room temperature in the noncentrosymmetric ${\mathrm{RbTiOPO}}_{4}$ crystal, codoped with ${\mathrm{Nb}}^{5+}$, for all three possible polarizations. A maximum output power of $154\phantom{\rule{0.2em}{0ex}}\mathrm{mW}$ at $1050\phantom{\rule{0.2em}{0ex}}\mathrm{nm}$ was obtained for an absorbed power of $386\phantom{\rule{0.2em}{0ex}}\mathrm{mW}$. The highest slope efficiency reached $\approx 60\%$ and the lowest threshold (with respect to the absorbed power) was $18\phantom{\rule{0.2em}{0ex}}\mathrm{mW}$. The laser was tunable from 1009 to $1081\phantom{\rule{0.2em}{0ex}}\mathrm{nm}$.

© 2007 Optical Society of America

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